It is narrated from Hazrat Abu Hurairah (may Allah be pleased with him) that a healthy Bedouin came to the service of the Noble Prophet (peace and blessings be upon him). The Noble Prophet (peace and blessings be upon him) asked him, "Has 'Umm Mildam' ever seized you?" He said, "What is 'Umm Mildam'?" The Prophet (peace and blessings be upon him) replied, "Fever." He asked, "What is fever?" The Noble Prophet (peace and blessings be upon him) said, "It is the heat between the body and the flesh." He said, "I have never felt such a thing in my body." Then the Noble Prophet (peace and blessings be upon him) asked, "Has 'Suda'' ever afflicted you?" He asked, "What is meant by 'Suda''?" The Noble Prophet (peace and blessings be upon him) replied, "The veins that run in a person's head (and because of which there is pain in the head)." He said, "I have never felt this pain in my body." When he left, the Noble Prophet (peace and blessings be upon him) said, "Whoever wants to see a person of Hell, he should look at this man."